October

2009

 * October 05, 2009 - Kasane Keko is introduced

2008

 * October 01, 2008 - Hagane Miku (M-Side) is introduced
 * October 31, 2008 - Kuro Meikane is introduced
 * October 31, 2008 - Akita Naru is introduced

2007

 * October 17, 2007 - Zatsune Miku is introduced

Misc

 * October 25, 2012 - Birthdate of Nori Tenshia
 * October 27, 0000 - Birthdate of Kuromine Zenne and Zinne
 * October 31, 0000 - Birthdate of Kuro Shinigami
 * October 31, 2008 - Birthdate of Kiru Meikane
 * October 31, 1993 - Birthdate of Kuro Meikane